Carbureter.



A. S.'COMSTO GK. GARBURETBR,

APPLICATION FILED 215.26, 1912.

1,064,445. Patented June 10,1913.-

l um 2i du@ 16 um i 4 V mem gwa a@ A may have a much larger area than the valve the latter may be provided with a sufiiciently strong spring to normally hold it firmly to its seat and to promptly close it as the engin-e suction is satisfied,` while the diaphragm applies sufficient power to promptly open the valve e'ven though the throttle may be open to only a moderate extent. lVhen the throttle is. opened tothe minimum extent'at which the engine can be operated the suction in Lthe vacuum chamber of the carbureter is fully and promptly satisfied through the constantly open air passage and without drawing in an undue proportion of fuel. As the throttle opens so as i to increase the suction within the vacuum the diaphragm for opening the valve a nice adjustment becomes possible which givesa perfectly satisfactory action under all conditions except'where there is a considerable variation inlad and except when in cold weather it becomes necessary to use an ex- 4 cessive quantity of fuel when the engine is first started because of the failure of the fuel to completely vaporize until the engine becomes heated.A These .difficulties which are not taken care of by the action of t-he diabe operated. The operator phragm I have overcome by providing a manually controlled valve for the auxiliary air port and located on the atmospheric side of the auxiliary valve, this regulating valve being provided with a controlling handle within easy reach ofthe operator. When therefore the load is materially increased, as by the climbing of a hill, essary to use a richer explosive mixture the operator may partially close the auxiliary air port thus increasing the suction applied to the fuel nipple. In starting the engine he may entirely close the auxiliary port and thus relatively increase 'the proportion of fuel employed7 enabling him not only to more easily start his engine when the w: allier is cold but also to drive his car as soon as the engine is start-ed. As the engine becomes warm the auxiliary air port may is thus provided with means directly under his control for properlyn regulating the mixture for running his engine.

The carbureter shown in the drawings is of a type in common use and comprising a body portion 10, inclosing a vacuum chamber 1l, a bowl 12 for containing the immediate supply of liquid fuel, this bowl being and it becomes nec- 18, and havinga backwardly-extending arm 19 for forcing the valve 15 to its seatwhen the float is raised by the liquid reaching the maximum level intended to be attained wit-hin the bowl.

4An air duct 20 leads upwardly through the bowl 12,.its lower end, shown at 21,l being open. A nipple 22 is located within the duct 2O and opens upwardly, and is connected by a suitable duct 23 with the chamberof the bowl 12. The upper end of the nipple 22 is a little above the level to which the liquid is permitted to rise by the float. needle valve 24 fits within the open end of the nipple `22, and is adjustably controlled by a stem 25 entering through the top wall of the body 10 and in threaded enga-gement therewith, and carrying at its outer end a thumb-nut 26. A nipple 27 leads from the chamber 11' and affords meansifor connecting this chamber with the I cylinders of the engine (not shown). -A throttle valve 28 is located at the outlet 'of the chamber 12 leading to the nipple 27, and' is controlled by means of a "lever-arm An auxiliary air is shown at 30, and is automatically controlled by means of a valve 31, provided with a stem 32 reciprocating through a cap 33, and carrying a. helical spring 34 reacting between the cap and an adjustable nut upon the stem, this spring normally holding the valve to its seat, audits tension being regulated by the adjustment of the nut. i

As thus described the carbureter is of common form, except that the air induction ports 43 enter the inlet passage 30 laterally. Its-parts may be variously arranged, but in practice are related substantially as described. The suction of the engine draws in air through the passages 20 and 30 and liquid from the nipple 22, the volume being i controlled by the throttle valve 28. The

carbureter as illustrated provides for a Set adjustment of the but the invention as hereinafter describe is applicable`also to carbureters of this type in which provision is made for varying the fuel-controlling valve 2li?` adjustment of the valve with the movement of the throttle valve.

ln this type of carbureters dilliculty has been encountered in so adjusting the regl gine, and the trouble has been to secure 130 1- lating valve mechanism of the supplemental such sensitiveness as will render the valve useful at moderate speeds Without making.

its controlling sprin too rigid to yield to the light suction fet in the chamber.' 11 when the throttle valve is nearlyclosed. In order to render the valve more sensitive, a

, flexiblediaphragm 36 is mounted in a suitable casing :37, in communication, through' diaphragm 36 tocause the valve' to open.'

'lllie tension of the spring 34 is so adjusted that when the throttle 2S is closed to provide he engine with itsminimum charge the suction ivithin the chamber ll lWill not besufficient to open the valve 3l, and-this suction is accordingly satisfied by the inflow` assage 20. Upon the opening of the thi-ott e to grad-- of air and liquid through the ually increase the charge, an additional supply of air is required in order that the increased suction shall not act too strongly upon the fluid nipple -and render the charge too rich. This" additional air supply is secured through the passage 30, the valve being opened by tlieactio'n y'of the suctiondirectly upon the valve and upon the much larger area of the diaphragm. When the throttle is more widely opened, to run the engine at higher speeds, the valve `31 -isopen substantially all the time and the suction in the chamber ll is suliicient to insure an ample supply of liquid.

, The valve for manually controlling the induction ports 43 is here sliovvnl as taking the form of a ring 44 encircling theupperl end of the nipple through which the passage 30 enters the vacuum chamber, and being .rotatablethereon The ring 44 is provided with apertures 45 'of the A same sizev and number as the ports 3these apertures and .ports being circumterentially spaced a sut'- i'icient distance so that, the ring may be turned to bring the ports and apertures out oi register, ilius providing for the regulation of the port aret'ti'as'may be desired. The ring al is' provided with a radially project ing arm -flG from which a link i7 leads to a hand lever i8 so located` as to be Within hand lever v48 is pivotally attached to al part-ofthe dash board-ot' an automobile but its position may be changed as desired and v'any'suitalole system of levers or links may be substituted for the single link 47 according to the judgment ofthe builder. By the movement of the lever 48 the ring Llfniay be shifted in' order to open the ports 48 as much as may be4 desired; I

I claim as my invention-f l. In a carbureter, in combination, a Vvacuum chamber, an air induction port and a fuel induction port open to such chamber, an auxiliary air port open to the vacuum chamber, a manually controllable regulating valve for the last named "port, a normally lclosedivalve in said port, a diaphragm di- ,rectly responsive to the lowering ot pressure in thelvacuum chamber, a stem supported by the diaphragm, and a 'lever fulcrui'ned upon a fixed support and operatively connected with the stem and having abearin'g on the 'valve in opposition to `its closing means.

2.111 a carbureter, in combination, a'

vacuum chamber, an air induction port and a fuel induction port open to such chamber,

Aan 4auxiliary air port open to the vacuum l chamber, a.manually'controllable regulating valve lfor the last named port, a normally closed valvein said port, a diaphragm direetly responsive to the lowering of pressure inthe vacuum chamber, astein supported by the diaphragm, a lever lulcrunied upon a fixed support and operatively connected Awith the stem andhaving a bearing on the valveV in opposition to its closing means and means for shifting the fulcrum of the lever.

3. In a carbureter, in combination, a vacuum chamber, an 'air induction port and afuel induction port open to such chamber, an auxiliaryair port open to the vacuum chamber, a normally closed valve in said port, a diaphragm directly responsive to the lowering of pressure in the vacui'im chamber, a stem supported by thel diaphragm, and-a lever fulcrumed upon a Afixed support and operatively connected with the stem and having a bearing on the valve in opposition ,to its closing means.

ALPHONSE() S. COMSTOCK. lWitnesses: l y

Louis K. Grinsen, E. M. KLAToi-IER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner ci Patents.

Washington, D. C. 

